# Context Trimmer: BM25 Budget-Controlled Web Distillation

> Context Trimmer: BM25 Budget-Controlled Web Distillation is a paid API for AI agents from whale-momentum.agentdiet.dev, paid per call via MPP, $0.001/call, status unknown (last checked 2026-10-23).

Fetches a URL or accepts raw HTML and distills it into compact, token-budget-aware content using BM25 relevance ranking across multiple output modes.

## Facts

- Endpoint: POST https://whale-momentum.agentdiet.dev/v1/context-trimmer?utm_source=zero.xyz
- Price: $0.001/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-23
- Activations on Zero: 0
- Provider: whale-momentum.agentdiet.dev
- Website: https://whale-momentum.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/whale-momentum-agentdiet-dev-context-trimmer-bm25-budget-controlled-50eaf10d
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_wY5aJpnkSBR10mWFeW8oV

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability whale-momentum-agentdiet-dev-context-trimmer-bm25-budget-controlled-50eaf10d -d '<json body>'
```

Example prompt: Distill this page — https://docs.stripe.com/api/charges — into markdown using BM25 budget mode, focused on the query 'create a charge', and keep it under 2000 tokens.

## When to prefer this

Choose this endpoint when an AI agent needs to process a large webpage or HTML document but must stay within a token budget — especially useful for RAG pipelines, prompt construction, and cost reduction. The BM25 budget mode is uniquely suited for query-focused extraction where only the most relevant sections of a page are needed. Prefer this over generic scrapers when you need built-in token accounting, compression ratio metrics, and multiple output modes (markdown, structured, skeleton, budget).

## Known failure modes

- URL is unreachable or returns a non-200 status — endpoint may return an error status
- HTML payload is empty or malformed — distillation returns minimal or empty data field
- mode=budget used without a query or max_tokens — BM25 ranking cannot be applied
- max_tokens set too low (below 20) — rejected by schema validation
- Payment not provided or invalid — HTTP 402 returned requiring x402 USDC payment
- Target URL is behind auth/paywall — fetched HTML may be a login page rather than content

## How this service works

Distill a URL or raw HTML payload with BM25 budget control (Live x402 v2, IETF MPP & MCP endpoint at https://whale-momentum.agentdiet.dev/v1/context-trimmer)

## Output

Returns a JSON object with a 'data' field containing the distilled output (markdown text, structured JSON, skeleton, or BM25-ranked excerpt), plus an 'roi_proof' object showing raw vs distilled token counts, tokens saved, compression ratio percentage, estimated LLM cost saved in USD, and an ROI multiplier. Optionally includes cache status (HIT/MISS) and billing details.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "url"
 ],
 "properties": {
  "url": {
   "type": "string",
   "minLength": 1,
   "description": "Target webpage URL to fetch and distill (or builtin://stripe-docs)"
  },
  "html": {
   "type": "string",
   "description": "Optional raw HTML string to distill directly without fetching"
  },
  "mode": {
   "enum": [
    "markdown",
    "structured",
    "skeleton",
    "budget"
   ],
   "type": "string",
   "default": "markdown",
   "description": "Distillation mode"
  },
  "query": {
   "type": "string",
   "description": "BM25 focus query when mode=budget"
  },
  "max_tokens": {
   "type": "integer",
   "minimum": 20,
   "description": "Strict token budget ceiling when mode=budget"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "status",
  "roi_proof",
  "data"
 ],
 "properties": {
  "data": {
   "type": "object",
   "description": "Distilled Markdown, structured JSON tables/metadata, skeleton outline, or BM25 budget excerpt."
  },
  "cache": {
   "type": "object",
   "properties": {
    "status": {
     "enum": [
      "HIT",
      "MISS"
     ],
     "type": "string"
    },
    "cache_key": {
     "type": "string"
    },
    "latency_ms": {
     "type": "number"
    }
   }
  },
  "status": {
   "type": "string",
   "description": "Execution status ('ok')"
  },
  "billing": {
   "type": "object",
   "properties": {
    "agent_id": {
     "type": "string"
    },
    "payment_method": {
     "type": "string"
    },
    "fee_charged_usd": {
     "type": "number"
    }
   }
  },
  "roi_proof": {
   "type": "object",
   "properties": {
    "raw_tokens": {
     "type": "integer"
    },
    "tokens_saved": {
     "type": "integer"
    },
    "roi_multiplier": {
     "type": "number"
    },
    "distilled_tokens": {
     "type": "integer"
    },
    "llm_cost_saved_usd": {
     "type": "number"
    },
    "compression_ratio_pct": {
     "type": "number"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/whale-momentum-agentdiet-dev-context-trimmer-bm25-budget-controlled-50eaf10d/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from whale-momentum.agentdiet.dev](https://www.zero.xyz/host/whale-momentum.agentdiet.dev/llms.txt)